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Scroll compressor rotation direction
Scroll compressors, like several other types of compressors, will only compress in one rotational direction. Comparing to normal 3-phase
fixed compressors, ZXV unit compressor rotational direction is checked at the right direction in the plant. Customer power connection
sequence does not change the compressor rotation direction.
Maximum compressor cycle
Maximum permitted starts per hour is 10.
Check before starting & during operation
Both valves should be fully opened on the liquid line, in order to prevent trapping liquid.
• Check that all valves are fully opened.
• After starting and operation conditions are stabilized, it is recommended to check the oil level in compressor(s) and see if
there is a need to add oil to ensure a sufficient oil level (halfway up the sight glass).
Do’s Don’ts
1. Unit should be grounded at all time
1. Don’t connect power supply directly to
the compressor at any time
2. Wait for at least 2 minutes after power disconnection
to do drive assm service
2. Don’t touch the chokes. These become hot during
operation.
3. Refrigerant charge connection size: ½” -20 UNF
(Not 7/16” – 20 UNF)
3. Don’t touch the condenser fins.
4. Pay special attention to refrigerant charge
– Liquid indicator should be full all the time
– Compressor suction sh should be ~5 to 10k
– Condensing temperature should be 8~10k larger than
ambient temperature
5. Liquid pipe line should be insulated by insulation material
(10 mm)
6. Safe oil level is from ¼ to ¾ of the compressor
oil sight glass
7. After compressor replacement, check the rotation.
If reverse rotation is observed, please change two
connections at the compressor t-box. Changing at unit’s
power supply will not correct reverse rotation.
8. With louvered fin, regular condenser cleaning is
necessary to keep unit operating efficiently.
9. Note that sound generated by the unit is not constant
due to changes in compressor speed
10. Parameter C16 (setC) /C17 (band)
– C16 = -6 & C17 = 10 (Default)
– C16 = -8 & C17 = 8
– C16 = -10 & C17 = 5
ZXV do’s and don’t
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